Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fc9ffd658bf25d…

MALICIOUS

PDF

68.6 KB Created: 2021-03-13 18:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b10dc9d70bd51051a8d784adf694b495 SHA-1: 3d38c9332f1fb07add1ad4ac3e524b3cabb326df SHA-256: e7fc9ffd658bf25deabe3112379dce7113631f32cf5279351f02e82db6a4e31b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=cybersecurity+for+dummies+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/bodorosuzuta/0iJyjgl/84593693554.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/89523276747.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/gapekuketuwavololexi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/HheQegf/wavixewefepedop.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/gfaM3hi/motorbike_vs_police_car.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/fizebazipej_sagip_zexuso_jafusebaso.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/dNieO9y/27818319846.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/Y61hPRP/51600879842.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/computer_application_in_mechanical_engineering.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/wixuwozesabuzabenuwiwasan.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/ifh5Oie/93556055573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fcc7aa39e05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_602b4a51cf5bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475564/normal_5fec1d2e1e150.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/9451922.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/henhhjj/dr_driving_2_game_unlimited_coins_free_download.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/systematic_and_unsystematic_risk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/1354650324.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5540 bytes
SHA-256: f647eaafa4271283a8b6be264dda1db007d8f486af114273fc799be96e363db9
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10924 bytes
SHA-256: 4f944256ff5873246f6a54a6dd1b8d5f9b39d47bb17c27fc87b155f21e665ea2

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